Vibrating screen



Aug. 13, 1935.

A. J. HAZLE, JR 2,010,858

VI BRATING SCREEN Filed July 29} 1952 2 Sheets-Sheet 1 r al a)? n/ 2362/91/7."

Aug. 13, 1935. A. J. HAZLE, JR 2,010,858

VIBRATING SCREEN Filed July 29, 1932 2 Sheets-Sheet 2 tion of the screen has sma- nois.

4 Albert that, in, Chicago, 111., assignor 'to B. F.

' -Grump, 00., Chicago, 111., a corporation of Illi- PATENT OFFICE .i

" Ajbne rion'mlma 1932, seri i rio 625,739

This invention relates to screening devices, and has reference more particularly to an improved screen of the vibrating type, wherein the material is vibrating in such a manner that the separation of the same is greatly facilitated.

It is an object of this invention to provide a vibrating screen in which the material to be separated isinitially moved both vertically and horizontally in a substantially oblong path, thereby causing thorough agitation in which the rear pora longitudinal movement for facilitating the discharge of the material.

It is also an object of this invention to provide a screening mechanism which will agitate the material a relatively greater amount at the beginning of the separation process than at the end of the process, the agitation graduallydecreasing as the material progresses toward the discharge end of the screen.

The invention comprises the novel structure and combination of parts hereinafter described and more particularly pointed out and defined in the appended claims.

In the accompanying drawings, which illustrate a preferred embodiment of this invention, and in which similar reference numerals refer to similar features inthe different views:

Figure 1 is a vertical sectional view of a screening mechanism embodying this invention;

Figure 2 is a transverse vertical view, partly in section, showing themanner-of connecting the eccentricmechanism to the vibrating frame which supports the screen, taken substantially on line II- II f Figure 1;

, Figure 3 is a vertical transverse view, partly in section, showing the pivotal support for the end of the frame which is adjacent the lower end of the screen, taken substantially on line III--III of Figure 1.

In the illustrated embodiment of this invention there is shown in the drawings a base structure or foundation including a superposed plate or base member Ic. Upon this plate lc are secured a pair of parallel side rails I a in the form of channel bars and which are transversely braced by a rod or member 2 which is connected to the rails and extends therebetween. At one end of the base structure the rails are provided with inwardly exr tending bearings 4' which are adapted to receive a pin 5 which forms a pivotal support for a link 6 through the lower end of which said pin extends.

A longitudinally extending oscillating support 1 is disposed between the rails I of the base structure and is provided at its rear end with a pair of integrally formed spaced bearing lugs 8' which are drilled for receivingapin 9 whichex-tends therebetween-and passes through an aperture in the upper end of the link 6, thereby forming a pivotal mounting for this end of the support.

The front end of the support I is mounted upon a crankshaft I 0 which extends transversely of the base structure and is journalled in bearings H secured to the top of the channel bars la. It will be noted that the support 1 is connected by mean". of a pair of bearing lugs 13 with the crank portion 12 of said shaft. The shaft I0 hasa fly wheel I4 between the bearing lugs l3 and this fly wheel is eccentrically mounted upon said crank 12 so as to bring the center thereof substantially in the axis of the journal portions of said shaft. One end of the shaft I0 is provided with suitable means for connection to a source of power, which, in this instance, is shown as comprising a pulley l5 over which a belt I6 is trained. This pulley is driven by a driving pulley I! which is connected by a suitable gear-reducing mechanism to a source of power such as an electric motor I8.

An upright frame l9 extends from the forward end of the support! and sustains the forward end of an inclined screen 20 and underlying pan or receptacle 2|. The screen 20 is stretched across a frame which may be of any desired construction. It is obvious that frames having screens of different sized mesh may be provided for placing above the pan, thereby regulating the size of material to be separated. It will be noted that the screen frame and pan, which are secured together in any appropriate manner, are secured as a unit at their upper ends to the upper end of the upright frame l9 by means of a hinge connection 22. The rear or lower portion of the screen and pan frames extends between a pair of upright members 23 which are spaced apart by a horizontally extending member 24 which is bolted to the oscillating support 1 by the through bolts 25. The uprights 23 are provided with aligned vertical slots 26 each having a series of inclined grooves arranged along one edge to form a rack for receiving and supporting a transverse rod member 21 which adjustably supports the rear end of the screen. It is, therefore, evident that the inclination of the pan and screen may be adjusted by varying the position of the rod 21. i

A discharge trough 28 is provided at the lower or rear end of the screen frame to receive the material which passes over the screen to convey and discharge it at one side of the screen. A discharge opening 29 is provided at the lower end of the pan 2| for the material which passes through the screen.

In operation, the device is set in motion by starting the motor 18 which drives the crank- 5 shaft and imparts a gyratory movement to the upper end of the screen and a substantially longitudinal shifting movement to the lower end thereof. It is, therefore, evident that the ma terial to be separated will be agitated more vio- 10 lently at the upper end of the-screen, the agitation gradually decreasing as the material moves towards the lower end thereof and the a base, a shaft journaled in said base and having a crank portion, a member extending longitudinally of said base, one end of said member being connected to said crank portion, a link swingably mounted on said base, the outer end of said link being pivotally connected to the other end of said member, an upright at said first mentioned end of said member and carried thereby, a screening element having one end pivoted on said upright, a pair of spaced uprights at the other end of said member, the screening element ex- "tending therebetween, said pair of uprights having longitudinally extending slots in alignment, each of said slots defining a series of inclined grooves along one side thereof, and a rod to support the free end of said element, said rod being movable along said slots and into said grooves to support the free end of the element at difierent levels, whereby the inclination of the screening element may be adjusted.

ALBERT J HAZLE, JR. 

